T-bolt.



' PATENTED MAY 9, 1905.

I G. R. LANG.

T-BOLT.

APPLIOATION FILED 00128.19 04.

M/I/E/VTUR Gearyefi Lang" WITNESSES:

i1 R/VEYS A TTU Patented May 9, 1905.

Orricn.

GEORGE ROSS LANG, OF CINCINNATI, OHIO.

'lT-BOLT...

SPECIFICATION forming part of Letters Patent No. 789,553, dated. May 9,1905.

Application filed October 28, 190 i- Serial No. 230,310.

To all whom, it Duty con/corn:

Be it known that I, (irnouon Ross LANG, a citizen of the United States,and a resident of Cincinnati, in the county of Hamilton and State ofOhio, have invented a new and improved T-Bolt, of which thefollowing isafull, clear, and exact description.

My invention relates to a T-bolt for use on planers, boring-mills, andother machine-tools to fasten the work upon the bed of the machine. Itis customary at the present time to clamp the work upon machines of thischaracter by means of bolts having heads passing into T-slots in thesurface of the bed. hen a different size or class of work is substitutedfor the one previously used, these bolts have to be changed, and huntingfor new bolts of the proper length consumes much time and is a greatwaste. Also when bolts of the proper length are not on hand new oneshave to be forged in a blacksmiths shop and threads turned upon them toreceive the nut which has to be used.

It is the object of my invention to do away with these expensive delaysand with the necessity for forging the bolts at frequent intervals. ThisI accomplish by means of a removable head for the bolt, which can beused with any length of bolt and does not have to be renewed.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 represents a transverse sectional view of a planer-bed providedwith a preferred form of my invention. Fig. 2 is a side elevation of oneof the removable heads. Fig. 3 is a longitudinal central section of thesame, and Fig. 4 is a bottom view of the same.

In the drawings, it represents the frame of the planer; I), the bed; 7/,the IF-slots in the bed; a, the work upon the bed, and (Z clamps whichare secured in position by means of bolts 0, nuts f, and T-heads g,which constitute the main part of my invention.

The particular form illustrated in the drawings represents theinvention; but it is not to be taken as being the only form in whichsaid invention is capable of embodiment. The bolt 0 is of very simpleconstruction, with a thread on each end. The T-head g is preferablyprovided with an angular T-shaped projection g, which is intended topass into the slots 7) in the bed from the top and lock itself with ahalf'turn. It is also provided with a projection at the other endthereof, having a cavity provided with an internal screw-thread g forreceiving the lower end of the bolt (1. By forming the T-head in themanner shown in Fig. 4 it can be inserted in one of the slots 7/ withoutremoving chips from the entire slot. When the work is changed and a beltof different length is required, it will not necessitate the use ofother T-heads, but merely the removal of the bolts therefrom, which canbe replaced by other bolts of different lengths. In case bolts of theproper length cannot be found it is a simple matter to take an ordinarypiece of round bar-iron or the like and turn the threads on it, so thatit will answer the purpose. The T-heads are preferably made of steel, sothat they will stand a great deal of strain and will consequently be ofvery long life. It will thus be seen that a most convenient and usefuldevice is obtained, that it is exceedingly easy to make bolts of anylength desired, that there is no trouble about slipping the heads intothe T-slots, that the work can be clamped through cored holes throughwhich it would be an impossibility to get an ordinary bolt-head, that ittakes up very little space, and that it has all the advantages of theordinary T-head bolt heretofore used for this purpose.

Having thus described my invention, I. claim as new and desire to secureby Letters Patent 1. A clamping device, com n-ising a bolt, a nuttherefor, and a separable head adjustably mounted upon the bolt, saidhead being provided with a contracted neck and a projection extending atright angles to the head from the end of the neck, said projection beingin the form of a parallelogram having acute and obtuse angles, wherebythe head is adapted to be moved into T-slots and is prevented fromturning therein.

2.. A clamping device com rising a bolt, a

nut therefor and a separable T-bolt head having a neck, an extensionthereon projecting outwardly therefrom and adapted to enter T- slots ina machine-tool bed, and means for securing said head to a bolt.

3. A clamping device comprising a bolt, a nut therefor and a separableT-bolt head having an angular extension projecting outwardly therefromat the lower end thereof, and a tubular projection upon the upper endthereof 10 having a screw-threaded cavity therein.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

GEORGE ROSS LANG. Witnesses:

S. E. SIMPSON, E. A. CADEN.

